遷徙之王北極燕鷗

An international team of scientists has officially crowned the Arctic tern (燕鷗) the king of long-distance migration (遷徙)， Every year， the tiny bird fliesnearly 45，000 miles on its trip from the northern tip of Greenland to the shoresof Antarctica and back again. That's equal to 60 trips around the Earth in thebird＇s Lifetime。